运行和等于方法或我正在做的任何错误的奇怪的事情

时间:2012-08-18 23:13:31

标签: java multithreading synchronization

我写了一个多线程程序,其中我看到了一些奇怪的行为。以下是代码。

class Task implements Runnable {
      private Command command;
      private BlockingQueue<Integer> existPool;
      private BlockingQueue<Integer> newPool;
      private int existId;
      private int newId;


      public Task(Command command, BlockingQueue<Integer> pool1, BlockingQueue<Integer> pool2) {
            this.command = command;
            this.existPool = pool1;
            this.newPool = pool2;
      }

public void run() {
    if(command.getDataCriteria().equals(PDSLnPConstants.DATA_CRITERIA_PREVIOUS)) {
    try {
        // Getting existing id from the pool
        existId = existPool.take();
        attributeGetSetMethod(existId);
    } catch (Exception e) {
        getLogger().log(LogLevel.ERROR, e.getLocalizedMessage());
    } finally {
        // And releasing that existing ID for re-use
        existPool.offer(existId);       
    }
    }

//Something wrong happening here
else if(command.getDataCriteria().equals(PDSLnPConstants.DATA_CRITERIA_NEW)) {
    try {
        // Getting new id from the pool
        newId = newPool.take();
        attributeGetSetMethod(newId);
    } catch (Exception e) {
        getLogger().log(LogLevel.ERROR, e.getLocalizedMessage());
    } finally {
        // And releasing that new ID for re-use
        newPool.offer(newId);   
    }
    }
}
}

从下面的代码中。以上运行方法正在调用。

    for (int i = startRange; i <= endRange; i++) {
    availableExistingIds.add(i);
    }

    for (int n = newStartRange; n <= newEndRange; n++) {
    availableNewIds.add(n);
    }

    BlockingQueue<Integer> existIdPool = new ArrayBlockingQueue<Integer>(11, false, availableExistingIds);
    BlockingQueue<Integer> newIdPool = new ArrayBlockingQueue<Integer>(21, false, availableNewIds);


    GUID_ID_MAPPING = new LinkedHashMap<Integer, LinkedHashMap<Integer, String>>();
    long startTime = System.currentTimeMillis();
    long endTime = startTime + (durationOfRun*60*1000L);

    // Running for particular duration of time
    while(System.currentTimeMillis() <= endTime) {
    Command nextCommand = getNextCommandToExecute();
    Task nextCommandExecutorRunnable = new Task(nextCommand, existIdPool, newIdPool);
    executorService.submit(nextCommandExecutorRunnable); // Submit it for execution
    }

问题陈述: -

我刚才注意到的一个奇怪的事情是 - 在下面的if if循环中,如果你在run方法if the command.getDataCriteria() is Previous中看到我的上面的代码,那么它也会被输入else if块(用于{{1当我正在进行New检查时,哪个不应该正常发生?为什么会这样?

.equals

更新: -

以下是我的控制台中的图片。enter image description here

您可以清楚地看到else if(command.getDataCriteria().equals(PDSLnPConstants.DATA_CRITERIA_NEW)) { ,然后转到dataCriteria was New

1 个答案:

答案 0 :(得分:1)

如果您的代码真的是

if(command.getDataCriteria().equals(PDSLnPConstants.DATA_CRITERIA_PREVIOUS)) {
   ...
else if(command.getDataCriteria().equals(PDSLnPConstants.DATA_CRITERIA_NEW)) {
   ...
}

然后两个...都不可能被执行。它不依赖于同步,线程,错误的等于实现或其他任何东西。还有一些你不理解的东西(它是否真的与两者中的run()调用相同?),或者可能是我对你的问题陈述无法理解的东西(这很令人困惑)。